feat: add webhook for failed registration #4857

Job	Run time
Generate SDKs	3m 22s
Run tests and lints	30m 0s
Run Playwright end-to-end tests (postgres)	6m 8s
Run Playwright end-to-end tests (cockroach)	7m 9s
Run Playwright end-to-end tests (sqlite)	6m 6s
Run end-to-end tests (postgres)	44m 18s
Run Playwright end-to-end tests (mysql)	6m 22s
Run end-to-end tests (cockroach)	45m 59s
Run end-to-end tests (sqlite)	42m 47s
Run end-to-end tests (mysql)	45m 20s
Build CLI docs	1m 15s
Generate changelog	0s
Generate release	0s
Release SDKs	0s
Render version schema	0s
Draft newsletter	0s
Pending approval Slack notification	0s
Send newsletter	0s
	3h 58m 46s

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